Like lots of social media users, Cynthia Greco underestimated the power of her own words.

The Hanover woman was scrolling Facebook when she read a status update from Facebook co-founder and CEO Mark Zuckerberg asking friends for suggestions for his personal challenge in 2015.

Zuckerberg's previous annual challenges — sort of a New Year's resolution on steroids — have included learning Mandarin, meeting new people and only eating meat from animals he personally killed.

This year, he turned to his social network for inspiration.

Greco — an audience development manager for the York Daily Record's parent company — responded to Zuckerberg's status on a whim.

"Read a new book every month," she wrote. "But, someone else gets to choose the book."

Greco said she rarely replies to status updates from people she doesn't personally know. She never expected Zuckerberg to acknowledge her comment.

Within minutes, he replied that it was a good idea.

Three days later, the 30-year-old entrepreneur — worth more than $33 billion — announced he was starting a book club for 2015 and launched a Facebook page that would form its hub. In his post, he thanked Greco for her suggestion and noted that her comment garnered 1,900 likes.

"It makes me realize that it's a small world," Greco said. "People are more accessible than we realize."

The "A Year of Books" club asks others to join Zuckerberg in reading a chosen book every two weeks and engaging in a discussion on the group's Facebook page.

Greco said she will be participating and has already begun reading the first book, "The End of Power" by Moises Naim.

She said she thinks Zuckerberg latched onto her idea because he wants to interact with others.

"I think everybody always expects people like him to do things that are more charity-oriented," she said. "But they do that stuff already. This is just something that he wanted to do with everybody, to engage."

Whatever his intention may be, Zuckerberg's impact on book sales is likely to be powerful. Zuckerberg has more than 31 million Facebook friends, and his book club's Facebook page already has almost 164,000 followers.

Dan Broker, general manager of Books-A-Million in Springettsbury Township, York County, said Zuckerberg's club could drive sales in a manner similar to Oprah Winfrey's book club or recommendations by TV talk show host Dr. Phil. Broker said Oprah's book club selections would often sell out quickly.

"He's going to tap into a whole other demographic Oprah may not be able to reach," Broker said.